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Woods Hole Oceanographic Institution

Dr Rob. L. Evans

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Publications
»Electrical Lithosphere Beneath the Kaapvaal Craton
»Gulf Of Mexico Gas Seep
»MELT MT Results
»MELT Area Off-Axis Structure
»Wrightsville Beach Geophysics and Hydrology
»Karst Formation off North Carolina
»Review of Shallow Offshore EM Work
»EPR MMR Experiment
»Towed EM System
»Offshore MT and Subduction Systems
»Shallow Porosity Structure on the Continental Shelf
»Oceanic and Continental Mantle Resistivity
»New Jersey EM Survey
»Eel River EM Survey
»Impact of groundwater on EM data
»Electrical structure of Slave Craton
»Report of Shoreline Change Workshop


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Rob. L. Evans, Greg Hirth, Kiyoshi Baba, Don Forsyth, Alan Chave & Randall Mackie, Geophysical evidence from the MELT area for compositional controls on oceanic plates, Nature, 8 Sept 2005

Magnetotelluric and seismic data, collected during the MELT experiment at the southern East Pacific Rise, constrain the distribution of melt beneath this mid-ocean-ridge spreading centre and also the evolution of the oceanic lithosphere during its early cooling history. Here we focus on structures imaged at distances,100 to 350km east of the ridge crest, corresponding to seafloor ages of ,1.3 to 4.5 million years (Myr), where the seismic and electrical conductivity structure is nearly constant and independent of age. Beginning at a depth of about 60 km, we image a large increase in electrical conductivity and a change from isotropic to transversely anisotropic electrical structure, with higher conductivity in the direction of fast propagation for seismic waves. Conductive cooling models predict structure that increases in depth with age, extending to about 30km at 4.5Myr ago.We infer, however, that the structure of young oceanic plates is instead controlled by a decrease in water content above a depth of 60 km induced by the melting process beneath the spreading centre

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